Granite
Phaneritic Felsic Igneous Rock
igneous
Category
Mineraloid (Man Made Glass)
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Granite
Granite (Felsic Plutonic Rock)
igneous
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Petoskey Stone
Favosites alpenensis
fossil
Graphite
Graphite (Carbon, C)
mineral
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Chert (Green Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
mineral
Mother of Pearl (Nacre)
Calcium Carbonate (Aragonite) with organic conchiolin
gemstone
Diamond
Carbon (C)
gemstone
Raw Diamond
Carbon (C)
gemstone
Granite
Phaneritic Felsic Igneous Rock
igneous
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond (in jewelry setting)
Carbon (C)
mineral
Granodiorite
Granodiorite
igneous
Diamond (in jewelry setting)
Adamantine Carbon (C)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
sedimentary (biogenic)
Diorite
Intermediate plutonic igneous rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary (fossilized)
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Red Sandstone
Arenite (with Iron Oxide / Hematite staining)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Basalt
Basalt (comprising Plagioclase feldspar, Pyroxene, and Olivine)
igneous
Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
igneous
Diamond
Carbon (C)
gemstone
Sandstone
Arenite (siliciclastic sedimentary rock composed mostly of quartz)
sedimentary
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Granite Pebble
Felsic intrusive igneous rock
igneous
Chrysocolla in Malachite
Cu2CO3(OH)2 (Malachite) / Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
mineral